The basic character set is Latin-1. This character set is defined by ISO
standard 8859, part 1. The lower half (character codes
16#7F#) is identical to standard ASCII coding, but the upper
half is used to represent additional characters. These include extended letters
used by European languages, such as French accents, the vowels with umlauts
used in German, and the extra letter A-ring used in Swedish.
For a complete list of Latin-1 codes and their encodings, see the source
file of library unit
Ada.Characters.Latin_1 in file
You may use any of these extended characters freely in character or
string literals. In addition, the extended characters that represent
letters can be used in identifiers.